It's just as easy to do them all in order to be safe, but you're not likely to cause any problems by the temporary difference of 5ft lbs on a given bolt. I loosen them all about a quarter of a turn first then I tighten back in order. If one needs a little more backing off (as much as another 1/4 turn or so) in order to get it to tighten down smoothly I'll do it by itself then.
If you lubed them with moly grease when you installed them tighten to 75ft lbs, if you lubed with 30wt oil torque to 80ft lbs... If you didn't chase the threads when you did the HG then just forget it as your torque reading are all going to be way low and you'll be redoing it in a year anyway.
It's good to do it when the engine isn't cold too.
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